Pre 1.8 release

Added Gamemode Spectator
Preparing 1.8 changes

Added Spectator Gamemode
Pre 1.8 release

Added Spectator gamemode
Preparing 1.8 update 

Added Spectator gamemode
Preparing 1.8 update

Partially added Spectator gamemode
Preparing 1.8 update
Update World.h
Added an explicit setting for allowing BungeeCord handshake.
Implementing Spectator Mode

Adding some proprieties of the spectator game mode in player.cpp :
- Players can't toss items
- Players can't touch the ground
Merge pull request #1437 from nesco/master

Implemented spectator gamemode.
Updated SQLiteCpp.

Our changes have made it into upstream, updating to sync with upstream master.
Voronoi biomegen: Added JitterSize and OddRowOffset.
Fixed minor style issues.
QtBiomeVisualiser: Fixed linux compilation.
QtBiomeVisualiser: More gcc fixes.